1 - Earth was formed from debris orbiting the Sun, 2 - Surface cools and forms the crust, 3 - Volcanoes produce lots of steam, carbon dioxide and ammonia, 4 - As the Earth continues to cool, steam turns into liquid water, 5 - Oceans are formed from liquid water, 6 - Carbon dioxide in the atmosphere dissolves into the oceans, 7 - First life forms develop in the oceans, 8 - First life forms photosynthesise and remove carbon dioxide from the atmosphere, 9 - Atmosphere is filled with oxygen from photosynthesis, creating the Ozone layer, 10 - Ozone layer allows more life forms to develop by protecting the Earth from harmful radiation,

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